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<li class="navelem"><a class="el" href="dir_0c017496b493ff066fbbe686970307ba.html">transport</a></li><li class="navelem"><a class="el" href="dir_e82f953eb2d89bcd842ae00e323ae1e5.html">detail</a></li>  </ul>
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<a href="detail_2asio__local__stream__socket_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/* Flow-IPC: Core</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright 2023 Akamai Technologies, Inc.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Licensed under the Apache License, Version 2.0 (the</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * &quot;License&quot;); you may not use this file except in</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * compliance with the License.  You may obtain a copy</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * of the License at</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *   https://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> *</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> * Unless required by applicable law or agreed to in</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * writing, software distributed under the License is</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> * distributed on an &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> * CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * See the License for the specific language governing</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * permissions and limitations under the License. */</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"></span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">/// @file</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"></span><span class="preprocessor">#pragma once</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span> </div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="preprocessor">#include &quot;<a class="code" href="detail_2asio__local__stream__socket__fwd_8hpp.html">ipc/transport/detail/asio_local_stream_socket_fwd.hpp</a>&quot;</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="preprocessor">#include &quot;<a class="code" href="util__fwd_8hpp.html">ipc/util/util_fwd.hpp</a>&quot;</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="preprocessor">#include &lt;flow/error/error.hpp&gt;</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span> </div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceipc_1_1transport_1_1asio__local__stream__socket.html">ipc::transport::asio_local_stream_socket</a></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span>{</div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span> </div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span><span class="comment">// Template implementations.</span></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span> </div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Task_err&gt;</div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"><a class="line" href="namespaceipc_1_1transport_1_1asio__local__stream__socket.html#a677a303f9f81cc5661bd2b34a29309f7">   31</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="namespaceipc_1_1transport_1_1asio__local__stream__socket.html#a677a303f9f81cc5661bd2b34a29309f7">on_wait_writable_or_error</a>(flow::log::Logger* logger_ptr,</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span>                               <span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>&amp; sys_err_code,</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span>                               <a class="code hl_struct" href="structipc_1_1util_1_1Native__handle.html">Native_handle</a> payload_hndl,</div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span>                               <span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc_1_1util.html#ae0be7edba7e30ffa3f8b742af621f2ab">util::Blob_const</a>&amp; payload_blob_ref,</div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span>                               <a class="code hl_typedef" href="namespaceipc_1_1transport_1_1asio__local__stream__socket.html#a1788f9dbd896bb71b3693f9ae25b40ae">Peer_socket</a>* peer_socket_ptr,</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span>                               Task_err&amp;&amp; on_sent_or_error)</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span>{</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span>  <span class="keyword">using </span><a class="code hl_function" href="namespaceipc_1_1util.html#a2bb38cee29dacbe56de5182221b45941">util::blob_data</a>;</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span>  <span class="keyword">using </span>flow::util::buffers_dump_string;</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span>  <span class="keyword">using </span>boost::asio::async_write;</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span>  <span class="keyword">using </span>boost::asio::bind_executor;</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span>  <span class="keyword">using </span>boost::asio::get_associated_executor;</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span>  <span class="keyword">using </span>boost::asio::post;</div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span> </div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span>  assert(peer_socket_ptr);</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span>  <span class="keyword">auto</span>&amp; peer_socket = *peer_socket_ptr;</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span>  <a class="code hl_typedef" href="namespaceipc_1_1util.html#ae0be7edba7e30ffa3f8b742af621f2ab">util::Blob_const</a> payload_blob(payload_blob_ref); <span class="comment">// So we can modify it.</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span> </div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span>  FLOW_LOG_SET_CONTEXT(logger_ptr, Log_component::S_TRANSPORT);</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span>  FLOW_LOG_TRACE(<span class="stringliteral">&quot;Connected local peer socket was waiting to write from location @ [&quot;</span> &lt;&lt; payload_blob.data() &lt;&lt; <span class="stringliteral">&quot;] &quot;</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span>                 <span class="stringliteral">&quot;plus native handle [&quot;</span> &lt;&lt; payload_hndl &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span>                 <span class="stringliteral">&quot;handler called, either ready or error; will try to send if appropriate.&quot;</span>);</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span> </div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span>  <span class="keywordflow">if</span> (sys_err_code)</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span>  {</div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span>    FLOW_ERROR_SYS_ERROR_LOG_WARNING();</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span>    FLOW_LOG_WARNING(<span class="stringliteral">&quot;Connected local peer socket was waiting to write from &quot;</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span>                     <span class="stringliteral">&quot;location @ [&quot;</span> &lt;&lt; payload_blob.data() &lt;&lt; <span class="stringliteral">&quot;] plus native handle [&quot;</span> &lt;&lt; payload_hndl &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span>                     <span class="stringliteral">&quot;but an unrecoverable error occurred; will not retry; posting handler.&quot;</span>);</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span> </div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span>    <span class="keyword">const</span> <span class="keyword">auto</span> executor = get_associated_executor(on_sent_or_error);</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span>    post(peer_socket.get_executor(),</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span>         bind_executor(executor,</div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span>                       [sys_err_code, on_sent_or_error = std::move(on_sent_or_error)]()</div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span>    {</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span>      on_sent_or_error(sys_err_code);</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span>    }));</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span> </div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span>    <span class="comment">// And that&#39;s it.</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span>    <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span>  }</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span> </div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span>  assert (!sys_err_code);</div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span>  <span class="comment">// No error.  Let us send as much as possible of remaining payload_blob; and the native handle payload_hndl.</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span> </div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span>  <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a> nb_err_code;</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> n_sent_or_zero</div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span>    = <a class="code hl_function" href="namespaceipc_1_1transport_1_1asio__local__stream__socket.html#a1022dfd42e9a0d6eab8384b0352decb0">nb_write_some_with_native_handle</a>(logger_ptr, peer_socket_ptr, payload_hndl, payload_blob, &amp;nb_err_code);</div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span> </div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span>  <span class="keywordflow">if</span> (n_sent_or_zero == 0)</div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span>  {</div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span>    <span class="comment">// Not even 1 byte of the blob was sent; and hence nor was payload_hndl (per contract of that function).</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span> </div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span>    <span class="keywordflow">if</span> (nb_err_code == boost::asio::error::would_block)</div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span>    {</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span>      FLOW_LOG_TRACE(<span class="stringliteral">&quot;Async wait indicates writability, yet write attempt indicated would-block; unusual but not &quot;</span></div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span>                     <span class="stringliteral">&quot;an error condition; we will try again.&quot;</span>);</div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span> </div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span>      <span class="comment">// Just like the initial wait (omitting comments for brevity; see async_wait() in main function above).</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span>      peer_socket.async_wait</div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span>        (Peer_socket::wait_write,</div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span>         [logger_ptr, payload_hndl, payload_blob, peer_socket_ptr,</div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span>          on_sent_or_error = std::move(on_sent_or_error)]</div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span>         (<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>&amp; sys_err_code) <span class="keyword">mutable</span></div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span>      {</div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span>        <a class="code hl_function" href="namespaceipc_1_1transport_1_1asio__local__stream__socket.html#a677a303f9f81cc5661bd2b34a29309f7">on_wait_writable_or_error</a>(logger_ptr, sys_err_code, payload_hndl, payload_blob, peer_socket_ptr,</div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span>                                  std::move(on_sent_or_error));</div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span>      });</div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span>      <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span>    }</div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span>    <span class="comment">// else</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span> </div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span>    assert(nb_err_code);</div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span> </div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span>    <span class="comment">// All other errors are fatal.  Retrying makes no sense.  Report the error and however much we&#39;d sent of blob.</span></div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span>    FLOW_LOG_WARNING(<span class="stringliteral">&quot;Connected local peer socket tried to write from &quot;</span></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span>                     <span class="stringliteral">&quot;location @ [&quot;</span> &lt;&lt; payload_blob.data() &lt;&lt; <span class="stringliteral">&quot;] plus native handle [&quot;</span> &lt;&lt; payload_hndl &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span>                     <span class="stringliteral">&quot;but an unrecoverable error occurred; will not retry; posting handler with error.&quot;</span>);</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span> </div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span>    <span class="keyword">const</span> <span class="keyword">auto</span> executor = get_associated_executor(on_sent_or_error);</div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span>    post(peer_socket.get_executor(),</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span>         bind_executor(executor,</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span>                       [get_logger, get_log_component, nb_err_code, on_sent_or_error = std::move(on_sent_or_error)]()</div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span>    {</div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span>      FLOW_LOG_TRACE(<span class="stringliteral">&quot;Handler started.&quot;</span>);</div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span>      on_sent_or_error(nb_err_code);</div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span>      FLOW_LOG_TRACE(<span class="stringliteral">&quot;Handler finished.&quot;</span>);</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span>      <span class="comment">// And that&#39;s it.  Async op finished.</span></div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span>    }));</div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span>    <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span>  } <span class="comment">// if (n_sent_or_zero == 0)</span></div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span>  <span class="comment">// else if (n_sent_or_zero &gt; 0)</span></div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span> </div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span>  assert (n_sent_or_zero &gt; 0);</div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span> </div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> orig_blob_size = payload_blob.size();</div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span>  payload_blob += n_sent_or_zero; <span class="comment">// Shift the buffer (size goes down, start goes right).</span></div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span>  <span class="keywordflow">if</span> (payload_blob.size() == 0)</div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span>  {</div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span>    FLOW_LOG_TRACE(<span class="stringliteral">&quot;Blob fully sent; hence posting handler with success code.&quot;</span>);</div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span> </div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span>    <span class="keyword">const</span> <span class="keyword">auto</span> executor = get_associated_executor(on_sent_or_error);</div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span>    post(peer_socket.get_executor(),</div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span>         bind_executor(executor,</div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span>                       [get_logger, get_log_component, on_sent_or_error = std::move(on_sent_or_error)]()</div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span>    {</div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span>      FLOW_LOG_TRACE(<span class="stringliteral">&quot;Handler started.&quot;</span>);</div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span>      on_sent_or_error(<a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>());</div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span>      FLOW_LOG_TRACE(<span class="stringliteral">&quot;Handler finished.&quot;</span>);</div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span>      <span class="comment">// And that&#39;s it.  Async op finished.</span></div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span>    }));</div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span>    <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span>  }</div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span> </div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span>  <span class="comment">// Log much like when about to perform the original handle-and-blob wait; except handle is now sent off.</span></div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span>  FLOW_LOG_TRACE(<span class="stringliteral">&quot;Continuing: Via connected local peer socket, will *only* send remaining &quot;</span></div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span>                 <span class="stringliteral">&quot;blob of size [&quot;</span> &lt;&lt; payload_blob.size() &lt;&lt; <span class="stringliteral">&quot;] located @ [&quot;</span> &lt;&lt; payload_blob.data() &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span> </div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span>  <span class="comment">// Verbose and slow (100% skipped unless log filter passes).</span></div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span>  FLOW_LOG_DATA(<span class="stringliteral">&quot;Continuing: Blob contents are &quot;</span></div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span>                <span class="stringliteral">&quot;[\n&quot;</span> &lt;&lt; buffers_dump_string(payload_blob, <span class="stringliteral">&quot;  &quot;</span>) &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span> </div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span>  <span class="comment">/* Subtlety: Here we could easily retry the async_wait() again, then nb_write_some_with_native_handle(), etc.;</span></div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno">  156</span><span class="comment">   * as in the would-block case above.  Why do we choose to use boost.asio</span></div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span><span class="comment">   * instead?  Answer: Well, A, we can, since the handle has been delivered.</span></div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span><span class="comment">   * And on_wait_writable_or_error() formally expects that payload_hndl is not null, meaning it lacks a mode to</span></div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span><span class="comment">   * nb_write_some_with_native_handle() only the blob.  Well, why not add that ability?</span></div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span><span class="comment">   * (It wouldn&#39;t be hard; sendmsg() -- the core of nb_write_some_with_native_handle() --</span></div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span><span class="comment">   * works just fine without using the ancillary-data</span></div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno">  162</span><span class="comment">   * feature at all.)  Answer: It&#39;s fine either way really.  I (ygoldfel) feel a tiny</span></div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span><span class="comment">   * bit better doing native/non-portable code only when necessary and reducing complexity of the native/non-portable</span></div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno">  164</span><span class="comment">   * code itself; in other words the extra branching could either go deeper into the native code flow, or a</span></div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno">  165</span><span class="comment">   * a bit higher up, and the latter appeals to me more.  On the other hand this does increase the number of different</span></div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span><span class="comment">   * types of transmission APIs we use; instead of sendmsg() used in 2 ways, we use sendmsg() in 1 way and boost.asio</span></div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span><span class="comment">   * async_write() in 1 way.  Potato, potahto....</span></div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span><span class="comment">   *</span></div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span><span class="comment">   * Side note: See how easy the following call is, not worrying about having to keep trying if it could only send</span></div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span><span class="comment">   * a partial amount?  async_write_with_native_handle() -- the thing we are implementing -- has those same semantics,</span></div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno">  171</span><span class="comment">   * which is why we&#39;re doing all that stuff in here, so our caller need not. */</span></div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span> </div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno">  173</span>  async_write(peer_socket, payload_blob,</div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno">  174</span>              [get_logger, get_log_component, <span class="comment">// Then we needn&#39;t do FLOW_LOG_SET_CONTEXT() inside before logging.</span></div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno">  175</span>               payload_blob, orig_blob_size, peer_socket_ptr,</div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno">  176</span>               on_sent_or_error = std::move(on_sent_or_error)]</div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno">  177</span>                (<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>&amp; sys_err_code, <span class="keywordtype">size_t</span>)</div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno">  178</span>  {</div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno">  179</span>    FLOW_LOG_TRACE(<span class="stringliteral">&quot;Connected local peer socket tried to write from location @ [&quot;</span> &lt;&lt; payload_blob.data() &lt;&lt; <span class="stringliteral">&quot;] &quot;</span></div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno">  180</span>                   <span class="stringliteral">&quot;plus NO native handle; handler called, either with success or error.&quot;</span>);</div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno">  181</span> </div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno">  182</span>    <span class="keywordflow">if</span> (sys_err_code)</div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno">  183</span>    {</div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno">  184</span>      FLOW_ERROR_SYS_ERROR_LOG_WARNING();</div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno">  185</span>      FLOW_LOG_WARNING(<span class="stringliteral">&quot;Connected local peer socket tried to write *only* blob &quot;</span></div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno">  186</span>                       <span class="stringliteral">&quot;located @ [&quot;</span> &lt;&lt; payload_blob.data() &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno">  187</span>                       <span class="stringliteral">&quot;but an unrecoverable error occurred; will not retry; posting handler with error.&quot;</span>);</div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno">  188</span>    }</div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno">  189</span> </div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno">  190</span>    <span class="comment">/* We must pass N to them, where N is the number of bytes in total, out of the *original* payload_blob, the entire</span></div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno">  191</span><span class="comment">     * async op -- not just this async_write() -- has been able to send.</span></div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno">  192</span><span class="comment">     *   - We got here because the one and only non-would-block sendmsg() already was able to send</span></div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno">  193</span><span class="comment">     *     `orig_blob_size - payload_blob.size()` bytes.  Recall that payload_blob now is the original payload_blob</span></div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno">  194</span><span class="comment">     *     shifted (`+`ed) by that many bytes.</span></div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno">  195</span><span class="comment">     *   - Then we tried to do the async_write(), and that sent a further `n_sent` bytes (possibly 0).</span></div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno">  196</span><span class="comment">     *   - Hence sum those 2 quantities to yield N. */</span></div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno">  197</span> </div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno">  198</span>    <span class="keyword">const</span> <span class="keyword">auto</span> executor = get_associated_executor(on_sent_or_error);</div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno">  199</span>    post(peer_socket_ptr-&gt;get_executor(),</div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno">  200</span>         bind_executor(executor,</div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno">  201</span>                       [get_logger, get_log_component,</div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno">  202</span>                        sys_err_code, on_sent_or_error = std::move(on_sent_or_error)]()</div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno">  203</span>    {</div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno">  204</span>      FLOW_LOG_TRACE(<span class="stringliteral">&quot;Handler started.&quot;</span>);</div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno">  205</span>      on_sent_or_error(sys_err_code);</div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno">  206</span>      FLOW_LOG_TRACE(<span class="stringliteral">&quot;Handler finished.&quot;</span>);</div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno">  207</span>      <span class="comment">// And that&#39;s it.  Async op finished.</span></div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno">  208</span>    }));</div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno">  209</span>  }); <span class="comment">// async_write()</span></div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno">  210</span>} <span class="comment">// on_wait_writable_or_error()</span></div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno">  211</span> </div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno">  212</span><span class="keyword">template</span>&lt;<span class="keywordtype">bool</span> TARGET_TBD,</div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno">  213</span>         <span class="keyword">typename</span> Task_err_blob, <span class="keyword">typename</span> Target_payload_blob_func, <span class="keyword">typename</span> Should_interrupt_func&gt;</div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno"><a class="line" href="namespaceipc_1_1transport_1_1asio__local__stream__socket.html#a21a4f47fcb36b51c30f45e27d79ca8d8">  214</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="namespaceipc_1_1transport_1_1asio__local__stream__socket.html#a21a4f47fcb36b51c30f45e27d79ca8d8">on_wait_readable_or_error</a>(flow::log::Logger* logger_ptr, <span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>&amp; async_err_code,</div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno">  215</span>                               <a class="code hl_typedef" href="namespaceipc_1_1transport_1_1asio__local__stream__socket.html#a1788f9dbd896bb71b3693f9ae25b40ae">Peer_socket</a>* peer_socket_ptr,</div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno">  216</span>                               Should_interrupt_func&amp;&amp; should_interrupt_func,</div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno">  217</span>                               Task_err_blob&amp;&amp; on_rcvd_or_error,</div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno">  218</span>                               Target_payload_blob_func&amp;&amp; target_payload_blob_func,</div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno">  219</span>                               <a class="code hl_typedef" href="namespaceipc_1_1util.html#a6cb62ae434900f3a8915b33ec5d61a96">util::Blob_mutable</a> target_payload_blob,</div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno">  220</span>                               <span class="keywordtype">size_t</span> n_rcvd_so_far)</div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno">  221</span>{</div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno">  222</span>  <span class="keyword">using </span><a class="code hl_typedef" href="namespaceipc_1_1util.html#a6cb62ae434900f3a8915b33ec5d61a96">util::Blob_mutable</a>;</div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno">  223</span>  <span class="keyword">using </span>boost::asio::bind_executor;</div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno">  224</span>  <span class="keyword">using </span>boost::asio::get_associated_executor;</div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno">  225</span>  <span class="keyword">using </span>boost::asio::post;</div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno">  226</span> </div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno">  227</span>  FLOW_LOG_SET_CONTEXT(logger_ptr, Log_component::S_TRANSPORT);</div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno">  228</span>  <span class="keywordflow">if</span> <span class="keyword">constexpr</span>(TARGET_TBD)</div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno">  229</span>  {</div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno">  230</span>    FLOW_LOG_TRACE(<span class="stringliteral">&quot;Connected local peer socket was waiting to read (1st time -- target buffer undetermined); &quot;</span></div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno">  231</span>                   <span class="stringliteral">&quot;handler called, either ready or error; will try to obtain target blob/receive if appropriate.&quot;</span>);</div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno">  232</span>    assert(n_rcvd_so_far == 0);</div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno">  233</span>  }</div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno">  234</span>  <span class="keywordflow">else</span></div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno">  235</span>  {</div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno">  236</span>    FLOW_LOG_TRACE(<span class="stringliteral">&quot;Connected local peer socket was waiting to read (target buffer known); &quot;</span></div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno">  237</span>                   <span class="stringliteral">&quot;handler called, either ready or error; will try to receive if appropriate.  &quot;</span></div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno">  238</span>                   <span class="stringliteral">&quot;Buffer location: @ [&quot;</span> &lt;&lt; target_payload_blob.data() &lt;&lt; <span class="stringliteral">&quot;], &quot;</span></div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno">  239</span>                   <span class="stringliteral">&quot;size [&quot;</span> &lt;&lt; target_payload_blob.size() &lt;&lt; <span class="stringliteral">&quot;] (already received [&quot;</span> &lt;&lt; n_rcvd_so_far &lt;&lt; <span class="stringliteral">&quot;]).&quot;</span>);</div>
<div class="line"><a id="l00240" name="l00240"></a><span class="lineno">  240</span>  }</div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno">  241</span> </div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno">  242</span>  <span class="keyword">auto</span>&amp; peer_socket = *peer_socket_ptr;</div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno">  243</span> </div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno">  244</span>  <span class="comment">/* Note: As promised we disregard any executor bound to the callbacks target_payload_blob_func()</span></div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno">  245</span><span class="comment">   * and should_interrupt_func().  This could be a feature added later, though the perf implications would</span></div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno">  246</span><span class="comment">   * be questionable:  Unlike on_rcvd_or_error() neither is the completion handler, so we&#39;d probably need</span></div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno">  247</span><span class="comment">   * to (1) post() a wrapper of either; then (2) within that wrapper at the end post() the subsequent</span></div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno">  248</span><span class="comment">   * work (the code that currently executes synchronously right after these calls at the moment). */</span></div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno">  249</span> </div>
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno">  250</span>  <span class="comment">/* Always, before placing anything into target buffer or anything else that would lead to completion handler,</span></div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno">  251</span><span class="comment">   * we must check for the operation being interrupted/canceled by user.  Hence it&#39;s too early to even check</span></div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno">  252</span><span class="comment">   * async_err_code which could lead to completion handler. */</span></div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno">  253</span>  <span class="keywordflow">if</span> (should_interrupt_func())</div>
<div class="line"><a id="l00254" name="l00254"></a><span class="lineno">  254</span>  {</div>
<div class="line"><a id="l00255" name="l00255"></a><span class="lineno">  255</span>    FLOW_LOG_TRACE(<span class="stringliteral">&quot;Interrupted locally.  Not proceeding further; not invoking completion handler.&quot;</span>);</div>
<div class="line"><a id="l00256" name="l00256"></a><span class="lineno">  256</span>    <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00257" name="l00257"></a><span class="lineno">  257</span>  }</div>
<div class="line"><a id="l00258" name="l00258"></a><span class="lineno">  258</span>  <span class="comment">// else OK, not interrupted during async-gap.  The floor is ours.</span></div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno">  259</span> </div>
<div class="line"><a id="l00260" name="l00260"></a><span class="lineno">  260</span>  <span class="comment">// Little helper to invoke completion handler.</span></div>
<div class="line"><a id="l00261" name="l00261"></a><span class="lineno">  261</span>  <span class="keyword">const</span> <span class="keyword">auto</span> finish = [&amp;](<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>&amp; err_code, <a class="code hl_typedef" href="namespaceipc_1_1util.html#a6cb62ae434900f3a8915b33ec5d61a96">util::Blob_mutable</a> blob)</div>
<div class="line"><a id="l00262" name="l00262"></a><span class="lineno">  262</span>  {</div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno">  263</span>    <span class="keyword">const</span> <span class="keyword">auto</span> executor = get_associated_executor(on_rcvd_or_error);</div>
<div class="line"><a id="l00264" name="l00264"></a><span class="lineno">  264</span>    post(peer_socket.get_executor(),</div>
<div class="line"><a id="l00265" name="l00265"></a><span class="lineno">  265</span>         bind_executor(executor,</div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno">  266</span>                       [err_code, blob, on_rcvd_or_error = std::move(on_rcvd_or_error)]()</div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno">  267</span>    {</div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno">  268</span>      on_rcvd_or_error(err_code, blob);</div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno">  269</span>    }));</div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno">  270</span>  };</div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno">  271</span> </div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno">  272</span>  <span class="keyword">auto</span> sys_err_code = async_err_code; <span class="comment">// Just so we can tactically modify it.</span></div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno">  273</span>  <span class="keywordflow">if</span> (sys_err_code)</div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno">  274</span>  {</div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno">  275</span>    FLOW_ERROR_SYS_ERROR_LOG_WARNING();</div>
<div class="line"><a id="l00276" name="l00276"></a><span class="lineno">  276</span>    finish(sys_err_code, <a class="code hl_typedef" href="namespaceipc_1_1util.html#a6cb62ae434900f3a8915b33ec5d61a96">Blob_mutable</a>());</div>
<div class="line"><a id="l00277" name="l00277"></a><span class="lineno">  277</span>    <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno">  278</span>  }</div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno">  279</span>  <span class="comment">// else wait results in no error; should be readable.</span></div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno">  280</span> </div>
<div class="line"><a id="l00281" name="l00281"></a><span class="lineno">  281</span>  <span class="keywordflow">if</span> <span class="keyword">constexpr</span>(TARGET_TBD)</div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno">  282</span>  {</div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno">  283</span>    <span class="comment">// First time we need to ask user&#39;s callback for the target buffer.</span></div>
<div class="line"><a id="l00284" name="l00284"></a><span class="lineno">  284</span>    assert(target_payload_blob.size() == 0);</div>
<div class="line"><a id="l00285" name="l00285"></a><span class="lineno">  285</span>    target_payload_blob = target_payload_blob_func();</div>
<div class="line"><a id="l00286" name="l00286"></a><span class="lineno">  286</span> </div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno">  287</span>    <span class="comment">// Handle corner case wherein they&#39;ve decided not to read anything after all.</span></div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno">  288</span>    <span class="keywordflow">if</span> (target_payload_blob.size() == 0)</div>
<div class="line"><a id="l00289" name="l00289"></a><span class="lineno">  289</span>    {</div>
<div class="line"><a id="l00290" name="l00290"></a><span class="lineno">  290</span>      FLOW_LOG_TRACE(<span class="stringliteral">&quot;Target blob has been determined: no read should proceed after all; degenerate case.  &quot;</span></div>
<div class="line"><a id="l00291" name="l00291"></a><span class="lineno">  291</span>                     <span class="stringliteral">&quot;Posting handler.&quot;</span>);</div>
<div class="line"><a id="l00292" name="l00292"></a><span class="lineno">  292</span> </div>
<div class="line"><a id="l00293" name="l00293"></a><span class="lineno">  293</span>      finish(<a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>(), target_payload_blob);</div>
<div class="line"><a id="l00294" name="l00294"></a><span class="lineno">  294</span>      <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno">  295</span>    }</div>
<div class="line"><a id="l00296" name="l00296"></a><span class="lineno">  296</span>    <span class="comment">// else</span></div>
<div class="line"><a id="l00297" name="l00297"></a><span class="lineno">  297</span> </div>
<div class="line"><a id="l00298" name="l00298"></a><span class="lineno">  298</span>    FLOW_LOG_TRACE(<span class="stringliteral">&quot;Target blob has been determined: location @ [&quot;</span> &lt;&lt; target_payload_blob.data() &lt;&lt; <span class="stringliteral">&quot;], &quot;</span></div>
<div class="line"><a id="l00299" name="l00299"></a><span class="lineno">  299</span>                   <span class="stringliteral">&quot;size [&quot;</span> &lt;&lt; target_payload_blob.size() &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00300" name="l00300"></a><span class="lineno">  300</span> </div>
<div class="line"><a id="l00301" name="l00301"></a><span class="lineno">  301</span>    <span class="comment">/* Finally can read non-blockingly -- since we know there are probably bytes to read, and where to read them,</span></div>
<div class="line"><a id="l00302" name="l00302"></a><span class="lineno">  302</span><span class="comment">     * and we haven&#39;t been canceled.  Though, we&#39;ll have to run non_blocking() first to set that mode if needed.</span></div>
<div class="line"><a id="l00303" name="l00303"></a><span class="lineno">  303</span><span class="comment">     * (All of this is thread-unsafe in various ways, but we talked about all that in our doc header.) */</span></div>
<div class="line"><a id="l00304" name="l00304"></a><span class="lineno">  304</span>    <span class="keywordflow">if</span> (!peer_socket.non_blocking()) <span class="comment">// This is an ultra-fast flag check (I verified): no sys call, no throwing.</span></div>
<div class="line"><a id="l00305" name="l00305"></a><span class="lineno">  305</span>    {</div>
<div class="line"><a id="l00306" name="l00306"></a><span class="lineno">  306</span>      peer_socket.non_blocking(<span class="keyword">true</span>, sys_err_code);</div>
<div class="line"><a id="l00307" name="l00307"></a><span class="lineno">  307</span>      <span class="keywordflow">if</span> (sys_err_code)</div>
<div class="line"><a id="l00308" name="l00308"></a><span class="lineno">  308</span>      {</div>
<div class="line"><a id="l00309" name="l00309"></a><span class="lineno">  309</span>        FLOW_LOG_WARNING(<span class="stringliteral">&quot;Wanted to nb-read to location @ [&quot;</span> &lt;&lt; target_payload_blob.data() &lt;&lt; <span class="stringliteral">&quot;], &quot;</span></div>
<div class="line"><a id="l00310" name="l00310"></a><span class="lineno">  310</span>                         <span class="stringliteral">&quot;size [&quot;</span> &lt;&lt; target_payload_blob.size() &lt;&lt; <span class="stringliteral">&quot;], and 1+ bytes are reportedly available, but &quot;</span></div>
<div class="line"><a id="l00311" name="l00311"></a><span class="lineno">  311</span>                         <span class="stringliteral">&quot;had to set non-blocking mode, and that op failed.&quot;</span>);</div>
<div class="line"><a id="l00312" name="l00312"></a><span class="lineno">  312</span>        FLOW_ERROR_SYS_ERROR_LOG_WARNING();</div>
<div class="line"><a id="l00313" name="l00313"></a><span class="lineno">  313</span> </div>
<div class="line"><a id="l00314" name="l00314"></a><span class="lineno">  314</span>        finish(sys_err_code, target_payload_blob);</div>
<div class="line"><a id="l00315" name="l00315"></a><span class="lineno">  315</span>        <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00316" name="l00316"></a><span class="lineno">  316</span>      }</div>
<div class="line"><a id="l00317" name="l00317"></a><span class="lineno">  317</span>      <span class="comment">// else</span></div>
<div class="line"><a id="l00318" name="l00318"></a><span class="lineno">  318</span>      assert(peer_socket.non_blocking());</div>
<div class="line"><a id="l00319" name="l00319"></a><span class="lineno">  319</span>      <span class="comment">// We will *not* &quot;undo&quot; for reasons explained in our doc header as of this writing.</span></div>
<div class="line"><a id="l00320" name="l00320"></a><span class="lineno">  320</span>    }</div>
<div class="line"><a id="l00321" name="l00321"></a><span class="lineno">  321</span>  } <span class="comment">// if constexpr(TARGET_TBD)</span></div>
<div class="line"><a id="l00322" name="l00322"></a><span class="lineno">  322</span>  <span class="comment">// else if constexpr(!TARGET_TBD) { Don&#39;t touch target_payload_blob_func in this instance of the template. }</span></div>
<div class="line"><a id="l00323" name="l00323"></a><span class="lineno">  323</span> </div>
<div class="line"><a id="l00324" name="l00324"></a><span class="lineno">  324</span>  assert(target_payload_blob.size() != 0);</div>
<div class="line"><a id="l00325" name="l00325"></a><span class="lineno">  325</span>  <span class="comment">// Okay, can really read now.</span></div>
<div class="line"><a id="l00326" name="l00326"></a><span class="lineno">  326</span> </div>
<div class="line"><a id="l00327" name="l00327"></a><span class="lineno">  327</span>  <span class="keyword">const</span> <span class="keyword">auto</span> remaining_target_payload_blob = target_payload_blob + n_rcvd_so_far; <span class="comment">// We still need the original.</span></div>
<div class="line"><a id="l00328" name="l00328"></a><span class="lineno">  328</span>  assert(remaining_target_payload_blob.size() != 0);</div>
<div class="line"><a id="l00329" name="l00329"></a><span class="lineno">  329</span> </div>
<div class="line"><a id="l00330" name="l00330"></a><span class="lineno">  330</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> n_rcvd = peer_socket.read_some(remaining_target_payload_blob, sys_err_code);</div>
<div class="line"><a id="l00331" name="l00331"></a><span class="lineno">  331</span>  <span class="keywordflow">if</span> (sys_err_code &amp;&amp; (sys_err_code != boost::asio::error::would_block))</div>
<div class="line"><a id="l00332" name="l00332"></a><span class="lineno">  332</span>  {</div>
<div class="line"><a id="l00333" name="l00333"></a><span class="lineno">  333</span>    assert(n_rcvd == 0);</div>
<div class="line"><a id="l00334" name="l00334"></a><span class="lineno">  334</span>    FLOW_LOG_WARNING(<span class="stringliteral">&quot;Wanted to nb-read to location @ [&quot;</span> &lt;&lt; remaining_target_payload_blob.data() &lt;&lt; <span class="stringliteral">&quot;], &quot;</span></div>
<div class="line"><a id="l00335" name="l00335"></a><span class="lineno">  335</span>                     <span class="stringliteral">&quot;size [&quot;</span> &lt;&lt; remaining_target_payload_blob.size() &lt;&lt; <span class="stringliteral">&quot;], and 1+ bytes are reportedly &quot;</span></div>
<div class="line"><a id="l00336" name="l00336"></a><span class="lineno">  336</span>                     <span class="stringliteral">&quot;available, but the nb-read failed (could be graceful disconnect; details below).&quot;</span>);</div>
<div class="line"><a id="l00337" name="l00337"></a><span class="lineno">  337</span>    FLOW_ERROR_SYS_ERROR_LOG_WARNING();</div>
<div class="line"><a id="l00338" name="l00338"></a><span class="lineno">  338</span> </div>
<div class="line"><a id="l00339" name="l00339"></a><span class="lineno">  339</span>    finish(sys_err_code, target_payload_blob);</div>
<div class="line"><a id="l00340" name="l00340"></a><span class="lineno">  340</span>    <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00341" name="l00341"></a><span class="lineno">  341</span>  }</div>
<div class="line"><a id="l00342" name="l00342"></a><span class="lineno">  342</span>  <span class="comment">// else no error, and we&#39;ve read [0, N] bytes.</span></div>
<div class="line"><a id="l00343" name="l00343"></a><span class="lineno">  343</span> </div>
<div class="line"><a id="l00344" name="l00344"></a><span class="lineno">  344</span>  <span class="keywordflow">if</span> (n_rcvd == remaining_target_payload_blob.size()) <span class="comment">// Then done and done.</span></div>
<div class="line"><a id="l00345" name="l00345"></a><span class="lineno">  345</span>  {</div>
<div class="line"><a id="l00346" name="l00346"></a><span class="lineno">  346</span>    assert(!sys_err_code);</div>
<div class="line"><a id="l00347" name="l00347"></a><span class="lineno">  347</span>    FLOW_LOG_TRACE(<span class="stringliteral">&quot;Successfully nb-read all expected data to location &quot;</span></div>
<div class="line"><a id="l00348" name="l00348"></a><span class="lineno">  348</span>                   <span class="stringliteral">&quot;@ [&quot;</span> &lt;&lt; remaining_target_payload_blob.data() &lt;&lt; <span class="stringliteral">&quot;], &quot;</span></div>
<div class="line"><a id="l00349" name="l00349"></a><span class="lineno">  349</span>                   <span class="stringliteral">&quot;size [&quot;</span> &lt;&lt; remaining_target_payload_blob.size() &lt;&lt; <span class="stringliteral">&quot;].  Posting handler.&quot;</span>);</div>
<div class="line"><a id="l00350" name="l00350"></a><span class="lineno">  350</span> </div>
<div class="line"><a id="l00351" name="l00351"></a><span class="lineno">  351</span>    finish(<a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>(), target_payload_blob);</div>
<div class="line"><a id="l00352" name="l00352"></a><span class="lineno">  352</span>    <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00353" name="l00353"></a><span class="lineno">  353</span>  }</div>
<div class="line"><a id="l00354" name="l00354"></a><span class="lineno">  354</span>  <span class="comment">// else we&#39;ve read [0, N - 1] bytes; must async-read the rest, because else would likely get would-block right now.</span></div>
<div class="line"><a id="l00355" name="l00355"></a><span class="lineno">  355</span> </div>
<div class="line"><a id="l00356" name="l00356"></a><span class="lineno">  356</span>  FLOW_LOG_TRACE(<span class="stringliteral">&quot;Successfully nb-read some (not all) expected data to &quot;</span></div>
<div class="line"><a id="l00357" name="l00357"></a><span class="lineno">  357</span>                 <span class="stringliteral">&quot;location @ [&quot;</span> &lt;&lt; remaining_target_payload_blob.data() &lt;&lt; <span class="stringliteral">&quot;], &quot;</span></div>
<div class="line"><a id="l00358" name="l00358"></a><span class="lineno">  358</span>                 <span class="stringliteral">&quot;size [&quot;</span> &lt;&lt; remaining_target_payload_blob.size() &lt;&lt; <span class="stringliteral">&quot;].  &quot;</span></div>
<div class="line"><a id="l00359" name="l00359"></a><span class="lineno">  359</span>                 <span class="stringliteral">&quot;Remaining: [&quot;</span> &lt;&lt; (remaining_target_payload_blob.size() - n_rcvd) &lt;&lt; <span class="stringliteral">&quot;] bytes.  &quot;</span></div>
<div class="line"><a id="l00360" name="l00360"></a><span class="lineno">  360</span>                 <span class="stringliteral">&quot;Will now async-read this (async-wait being first part of that).&quot;</span>);</div>
<div class="line"><a id="l00361" name="l00361"></a><span class="lineno">  361</span> </div>
<div class="line"><a id="l00362" name="l00362"></a><span class="lineno">  362</span>  n_rcvd_so_far += n_rcvd; <span class="comment">// See below.</span></div>
<div class="line"><a id="l00363" name="l00363"></a><span class="lineno">  363</span>  peer_socket.async_wait</div>
<div class="line"><a id="l00364" name="l00364"></a><span class="lineno">  364</span>    (Peer_socket::wait_read, [logger_ptr, peer_socket_ptr, target_payload_blob, n_rcvd_so_far,</div>
<div class="line"><a id="l00365" name="l00365"></a><span class="lineno">  365</span>                              on_rcvd_or_error = std::move(on_rcvd_or_error),</div>
<div class="line"><a id="l00366" name="l00366"></a><span class="lineno">  366</span>                              should_interrupt_func = std::move(should_interrupt_func)]</div>
<div class="line"><a id="l00367" name="l00367"></a><span class="lineno">  367</span>                               (<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>&amp; async_err_code) <span class="keyword">mutable</span></div>
<div class="line"><a id="l00368" name="l00368"></a><span class="lineno">  368</span>  {</div>
<div class="line"><a id="l00369" name="l00369"></a><span class="lineno">  369</span>    on_wait_readable_or_error&lt;false&gt; <span class="comment">// false =&gt; See just below for meaning.</span></div>
<div class="line"><a id="l00370" name="l00370"></a><span class="lineno">  370</span>      (logger_ptr, async_err_code, peer_socket_ptr, std::move(should_interrupt_func), std::move(on_rcvd_or_error),</div>
<div class="line"><a id="l00371" name="l00371"></a><span class="lineno">  371</span>       0, <span class="comment">// false =&gt; Ignore this.</span></div>
<div class="line"><a id="l00372" name="l00372"></a><span class="lineno">  372</span>       target_payload_blob, <span class="comment">// false =&gt; Read into this place (past the bytes in next arg).</span></div>
<div class="line"><a id="l00373" name="l00373"></a><span class="lineno">  373</span>       n_rcvd_so_far); <span class="comment">// Keep making progress -- this was incremented above.</span></div>
<div class="line"><a id="l00374" name="l00374"></a><span class="lineno">  374</span>  });</div>
<div class="line"><a id="l00375" name="l00375"></a><span class="lineno">  375</span>} <span class="comment">// on_wait_readable_or_error()</span></div>
<div class="line"><a id="l00376" name="l00376"></a><span class="lineno">  376</span> </div>
<div class="line"><a id="l00377" name="l00377"></a><span class="lineno">  377</span>} <span class="comment">// namespace ipc::transport::asio_local_stream_socket</span></div>
<div class="ttc" id="adetail_2asio__local__stream__socket__fwd_8hpp_html"><div class="ttname"><a href="detail_2asio__local__stream__socket__fwd_8hpp.html">asio_local_stream_socket_fwd.hpp</a></div></div>
<div class="ttc" id="anamespaceipc_1_1transport_1_1asio__local__stream__socket_html"><div class="ttname"><a href="namespaceipc_1_1transport_1_1asio__local__stream__socket.html">ipc::transport::asio_local_stream_socket</a></div><div class="ttdoc">Additional (versus boost.asio) APIs for advanced work with local stream (Unix domain) sockets includi...</div><div class="ttdef"><b>Definition:</b> <a href="asio__local__stream__socket_8cpp_source.html#l00031">asio_local_stream_socket.cpp:32</a></div></div>
<div class="ttc" id="anamespaceipc_1_1transport_1_1asio__local__stream__socket_html_a1022dfd42e9a0d6eab8384b0352decb0"><div class="ttname"><a href="namespaceipc_1_1transport_1_1asio__local__stream__socket.html#a1022dfd42e9a0d6eab8384b0352decb0">ipc::transport::asio_local_stream_socket::nb_write_some_with_native_handle</a></div><div class="ttdeci">size_t nb_write_some_with_native_handle(flow::log::Logger *logger_ptr, Peer_socket *peer_socket_ptr, Native_handle payload_hndl, const util::Blob_const &amp;payload_blob, Error_code *err_code)</div><div class="ttdoc">boost.asio extension similar to peer_socket-&gt;non_blocking(true); auto n = peer_socket-&gt;write_some(pay...</div><div class="ttdef"><b>Definition:</b> <a href="asio__local__stream__socket_8cpp_source.html#l00036">asio_local_stream_socket.cpp:36</a></div></div>
<div class="ttc" id="anamespaceipc_1_1transport_1_1asio__local__stream__socket_html_a1788f9dbd896bb71b3693f9ae25b40ae"><div class="ttname"><a href="namespaceipc_1_1transport_1_1asio__local__stream__socket.html#a1788f9dbd896bb71b3693f9ae25b40ae">ipc::transport::asio_local_stream_socket::Peer_socket</a></div><div class="ttdeci">Protocol::socket Peer_socket</div><div class="ttdoc">Short-hand for boost.asio Unix domain peer stream-socket (usually-connected-or-empty guy).</div><div class="ttdef"><b>Definition:</b> <a href="asio__local__stream__socket__fwd_8hpp_source.html#l00114">asio_local_stream_socket_fwd.hpp:114</a></div></div>
<div class="ttc" id="anamespaceipc_1_1transport_1_1asio__local__stream__socket_html_a21a4f47fcb36b51c30f45e27d79ca8d8"><div class="ttname"><a href="namespaceipc_1_1transport_1_1asio__local__stream__socket.html#a21a4f47fcb36b51c30f45e27d79ca8d8">ipc::transport::asio_local_stream_socket::on_wait_readable_or_error</a></div><div class="ttdeci">void on_wait_readable_or_error(flow::log::Logger *logger_ptr, const Error_code &amp;async_err_code, Peer_socket *peer_socket_ptr, Should_interrupt_func &amp;&amp;should_interrupt_func, Task_err_blob &amp;&amp;on_rcvd_or_error, Target_payload_blob_func &amp;&amp;target_payload_blob_func, util::Blob_mutable target_payload_blob, size_t n_rcvd_so_far)</div><div class="ttdoc">Helper of async_read_with_target_func() containing its core (asynchronously) recursive implementation...</div><div class="ttdef"><b>Definition:</b> <a href="detail_2asio__local__stream__socket_8hpp_source.html#l00214">asio_local_stream_socket.hpp:214</a></div></div>
<div class="ttc" id="anamespaceipc_1_1transport_1_1asio__local__stream__socket_html_a677a303f9f81cc5661bd2b34a29309f7"><div class="ttname"><a href="namespaceipc_1_1transport_1_1asio__local__stream__socket.html#a677a303f9f81cc5661bd2b34a29309f7">ipc::transport::asio_local_stream_socket::on_wait_writable_or_error</a></div><div class="ttdeci">void on_wait_writable_or_error(flow::log::Logger *logger_ptr, const Error_code &amp;sys_err_code, Native_handle payload_hndl, const util::Blob_const &amp;payload_blob_ref, Peer_socket *peer_socket_ptr, Task_err &amp;&amp;on_sent_or_error)</div><div class="ttdoc">Helper of async_write_with_native_handle() used as the callback executed when waiting for writability...</div><div class="ttdef"><b>Definition:</b> <a href="detail_2asio__local__stream__socket_8hpp_source.html#l00031">asio_local_stream_socket.hpp:31</a></div></div>
<div class="ttc" id="anamespaceipc_1_1util_html_a2bb38cee29dacbe56de5182221b45941"><div class="ttname"><a href="namespaceipc_1_1util.html#a2bb38cee29dacbe56de5182221b45941">ipc::util::blob_data</a></div><div class="ttdeci">const uint8_t * blob_data(const Blob_const &amp;blob)</div><div class="ttdoc">Syntactic-sugary helper that returns pointer to first byte in an immutable buffer,...</div><div class="ttdef"><b>Definition:</b> <a href="ipc__core_2src_2ipc_2util_2util_8cpp_source.html#l00158">util.cpp:158</a></div></div>
<div class="ttc" id="anamespaceipc_1_1util_html_a6cb62ae434900f3a8915b33ec5d61a96"><div class="ttname"><a href="namespaceipc_1_1util.html#a6cb62ae434900f3a8915b33ec5d61a96">ipc::util::Blob_mutable</a></div><div class="ttdeci">boost::asio::mutable_buffer Blob_mutable</div><div class="ttdoc">Short-hand for an mutable blob somewhere in memory, stored as exactly a void* and a size_t.</div><div class="ttdef"><b>Definition:</b> <a href="util__fwd_8hpp_source.html#l00140">util_fwd.hpp:140</a></div></div>
<div class="ttc" id="anamespaceipc_1_1util_html_ae0be7edba7e30ffa3f8b742af621f2ab"><div class="ttname"><a href="namespaceipc_1_1util.html#ae0be7edba7e30ffa3f8b742af621f2ab">ipc::util::Blob_const</a></div><div class="ttdeci">boost::asio::const_buffer Blob_const</div><div class="ttdoc">Short-hand for an immutable blob somewhere in memory, stored as exactly a void const * and a size_t.</div><div class="ttdef"><b>Definition:</b> <a href="util__fwd_8hpp_source.html#l00134">util_fwd.hpp:134</a></div></div>
<div class="ttc" id="anamespaceipc_html_aa3192e586cc45d3e7c22463bf2760f89"><div class="ttname"><a href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">ipc::Error_code</a></div><div class="ttdeci">flow::Error_code Error_code</div><div class="ttdoc">Short-hand for flow::Error_code which is very common.</div><div class="ttdef"><b>Definition:</b> <a href="common_8hpp_source.html#l00298">common.hpp:298</a></div></div>
<div class="ttc" id="astructipc_1_1util_1_1Native__handle_html"><div class="ttname"><a href="structipc_1_1util_1_1Native__handle.html">ipc::util::Native_handle</a></div><div class="ttdoc">A monolayer-thin wrapper around a native handle, a/k/a descriptor a/k/a FD.</div><div class="ttdef"><b>Definition:</b> <a href="native__handle_8hpp_source.html#l00062">native_handle.hpp:63</a></div></div>
<div class="ttc" id="autil__fwd_8hpp_html"><div class="ttname"><a href="util__fwd_8hpp.html">util_fwd.hpp</a></div></div>
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